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DeFi Yield Finder API
Best DeFi yields ranked by APY -- lending, staking, LP across 100+ protocols. Powered by DeFiLlama. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"defi-yields": {
"url": "https://defi-yields.api.klymax402.com/mcp"
}
}
}Quickstart -- HTTP (x402)
curl "https://defi-yields.api.klymax402.com/api/yields?token=..."
# -> 402 Payment Required, with an x402 payment challenge in the response bodyAny x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
defi_find_best_yields | GET | /api/yields | $0.005 | Find best DeFi yield opportunities for a token |
defi_find_best_yields | POST | /api/yields | $0.005 | Find best DeFi yield opportunities for a token (POST variant) |
defi_find_best_yields
Use this when you need to find the best DeFi yields for a token across all chains and protocols. Returns ranked opportunities in JSON.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
token | string | yes | Token symbol to find yields for (e.g. USDC, ETH, WBTC) |
chain | string | no | Filter by chain (e.g. base, ethereum, arbitrum, polygon). Optional — returns all chains if omitted. |
minTvl | number | no | Minimum TVL in USD to filter pools (default: 100000) |
limit | number | no | Number of results to return (default: 10, max: 50) |
Returns
pool-- pool/vault name and pairprotocol-- protocol name (Aave, Compound, Lido, Aerodrome, etc.)chain-- which blockchain networkapy-- current annual percentage yieldtvl-- total value locked in USDriskLevel-- risk assessment (low/medium/high)type-- yield type (lending, staking, LP, vault)
Example response:
{"pools":[{"pool":"USDC Lending","protocol":"Aave V3","chain":"base","apy":4.82,"tvl":125000000,"riskLevel":"low","type":"lending"}],"token":"USDC","totalPools":15}When to use: deploying idle capital to find the highest safe yield. Essential for yield optimization and DeFi strategy comparison.
Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio), liquidation risk (use defi_get_liquidation_levels).
defi_find_best_yields
Use this when you need to find the best DeFi yields for a token across all chains and protocols. Returns ranked opportunities in JSON. POST variant of defi_find_best_yields -- same params passed as JSON body instead of query string.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
token | string | yes | Token symbol to find yields for (e.g. USDC, ETH, WBTC) |
chain | string | no | Filter by chain (e.g. base, ethereum, arbitrum, polygon). Optional — returns all chains if omitted. |
minTvl | number | no | Minimum TVL in USD to filter pools (default: 100000) |
limit | number | no | Number of results to return (default: 10, max: 50) |
Returns
pool-- pool/vault name and pairprotocol-- protocol name (Aave, Compound, Lido, Aerodrome, etc.)chain-- which blockchain networkapy-- current annual percentage yieldtvl-- total value locked in USDriskLevel-- risk assessment (low/medium/high)type-- yield type (lending, staking, LP, vault)
Example response:
{"pools":[{"pool":"USDC Lending","protocol":"Aave V3","chain":"base","apy":4.82,"tvl":125000000,"riskLevel":"low","type":"lending"}],"token":"USDC","totalPools":15}When to use: deploying idle capital to find the highest safe yield. Essential for yield optimization and DeFi strategy comparison.
Not for: swap quotes (use dex_get_swap_quote), wallet balance (use wallet_get_portfolio), liquidation risk (use defi_get_liquidation_levels).
Example agent prompts
- "Find the best DeFi yields for a token across all chains and protocols"
- "Find the best DeFi yields for a token across all chains and protocols"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT